Skip the auto shop - Our mechanics make house calls

Q: I have three cats on my truck 2 up by both exhaust manifolds and 1 right before muffler can I take the one by muffler off n have n

asked by on

3 catalytic converters.
My car has an automatic transmission.

Hi there. Your message was a bit hard to understand, but I think I know what you’re getting at. On most trucks like yours, with the tri-catalytic converter set up, in some cases, the issue is with the rear or single cat - the one on the single exhaust pipe. Generally, due to the excessive particulate matter emissions from diesels, the two individual cats from each side of the engine would clog first. However, the rear tends to fail worse than the other two. By removing the third catalytic converter, you might improve engine output and power, but it would fail a smog inspection quickly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • I have three cats on my truck 2 up by both exhaust manifolds and 1 right before muffler can I take the one by muffler off n have n

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Truck still won't stay running when you push the gas to go ?

Hi there. Of the parts you listed, the only parts that might have contributed to this problem is the throttle position sensor. In most cases, this is a fuel delivery problem, caused either by a dirty fuel filter, fuel pump...

Q: No brake fluid to back brakes.

Claimed by Kevin Gainer

Q: I replaced all pads and rotors. There is pulsating /grinding noise when I brake. Is it a reluctor ring or sensor?

Pull the fuse for the ABS system to disable it and then test drive the car (don't forget to re-install the fuse later). If the pulsating/grinding noise remains that means the ABS system has nothing to do with your...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...